ex4-2.tex
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	\documentclass[tikz,convert={outfile=\jobname.svg}]{standalone}
	\usepackage{pgfplots}
	\usetikzlibrary{calc,patterns,snakes}
	% \usetikzlibrary{...}% tikz package already loaded by 'tikz' option
	\begin{document}
	\begin{tikzpicture}[scale=0.8]
	\begin{axis}[xlabel=x (mm), ylabel=u (mm),
	xmin=0,ymin=0,xmax=2,ymax=1.5]
	\addplot [thick,dashed,color=black, mark=none] coordinates { (0,0) (0.1,0.1425) (0.2,0.27)
	(0.3,0.3825) (0.4,0.48) (0.5,0.5625) (0.6,0.63) (0.7,0.6825)
	(0.8,0.72) (0.9,0.7425) (1,0.75) (1.1,0.7425) (1.2,0.72) (1.3,0.6825)
	(1.4,0.63) (1.5,0.5625) (1.6,0.48) (1.7,0.3825) (1.8,0.27) (1.9,0.1425) (2,0)};
	\addlegendentry{Approximation};
	\addplot[thick,color=red, mark=none] coordinates { (0,0) (1,1) (2,0) };
	\addlegendentry{Exact};
	\end{axis}
	\end{tikzpicture}
	\end{document}